Formal communication is when people use the rules of language in a conversation or in writing format. In a conversation, it would be more likely for you to use formal communication when in an interview or writing a letter to a business or maybe work.
The way of formal communication is by approaching him/her in an appropriate manner be polite and don't speak many words that is not relevant to the topic just be in the track always and keep looking in the eye of your audience or partner.
Formal communication is that which is connected with the formal organizational arrangement and the official status or the place of the communicator and the receiver. It moves through the formal channels authoritatively accepted positions in the organization chart. Formal communication is mostly in black and white.
A type of verbal presentation or document intended to share information and which conforms to established professional rules, standards and processes and avoids using slang terminology. The main types of formal communication within a business are (1) downward where information moves from higher management to subordinate employees, (2) upward where information moves from employees to management and (3) horizontal where information is shared between peers.